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A fighting game from Culture Brain and a spin-off of their Hiryu no Ken (Flying Dragon) series. There were plans to bring the game stateside as "Galactic Defender," but the release was cancelled.
SD Hiryu no Ken is a 1994 fighting game for the Super Famicom that features 15 different characters, including the hero of the Hiryu no Ken/Flying Dragon series Ryuhi. As the name implies, the characters have super-deformed proportions.
The game was also released to the Game Boy as SD Hiryu no Ken Gaiden, and that port would receive a sequel in SD Hiryu no Ken Gaiden 2.